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/* Simple Plugin API
*
* Copyright © 2018 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef SPA_LIST_H
#define SPA_LIST_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* \defgroup spa_list List
* Doubly linked list data structure
*/
/**
* \addtogroup spa_list List
* \{
*/
struct spa_list {
struct spa_list *next;
struct spa_list *prev;
};
#define SPA_LIST_INIT(list) (struct spa_list){ list, list }
static inline void spa_list_init(struct spa_list *list)
{
*list = SPA_LIST_INIT(list);
}
#define spa_list_is_empty(l) ((l)->next == (l))
static inline void spa_list_insert(struct spa_list *list, struct spa_list *elem)
{
elem->prev = list;
elem->next = list->next;
list->next = elem;
elem->next->prev = elem;
}
static inline void spa_list_insert_list(struct spa_list *list, struct spa_list *other)
{
if (spa_list_is_empty(other))
return;
other->next->prev = list;
other->prev->next = list->next;
list->next->prev = other->prev;
list->next = other->next;
}
static inline void spa_list_remove(struct spa_list *elem)
{
elem->prev->next = elem->next;
elem->next->prev = elem->prev;
}
#define spa_list_first(head, type, member) \
SPA_CONTAINER_OF((head)->next, type, member)
#define spa_list_last(head, type, member) \
SPA_CONTAINER_OF((head)->prev, type, member)
#define spa_list_append(list, item) \
spa_list_insert((list)->prev, item)
#define spa_list_prepend(list, item) \
spa_list_insert(list, item)
#define spa_list_is_end(pos, head, member) \
(&(pos)->member == (head))
#define spa_list_next(pos, member) \
SPA_CONTAINER_OF((pos)->member.next, __typeof__(*pos), member)
#define spa_list_prev(pos, member) \
SPA_CONTAINER_OF((pos)->member.prev, __typeof__(*pos), member)
#define spa_list_consume(pos, head, member) \
for (pos = spa_list_first(head, __typeof__(*pos), member); \
!spa_list_is_empty(head); \
pos = spa_list_first(head, __typeof__(*pos), member))
#define spa_list_for_each_next(pos, head, curr, member) \
for (pos = spa_list_first(curr, __typeof__(*pos), member); \
!spa_list_is_end(pos, head, member); \
pos = spa_list_next(pos, member))
#define spa_list_for_each_prev(pos, head, curr, member) \
for (pos = spa_list_last(curr, __typeof__(*pos), member); \
!spa_list_is_end(pos, head, member); \
pos = spa_list_prev(pos, member))
#define spa_list_for_each(pos, head, member) \
spa_list_for_each_next(pos, head, head, member)
#define spa_list_for_each_reverse(pos, head, member) \
spa_list_for_each_prev(pos, head, head, member)
#define spa_list_for_each_safe_next(pos, tmp, head, curr, member) \
for (pos = spa_list_first(curr, __typeof__(*pos), member); \
tmp = spa_list_next(pos, member), \
!spa_list_is_end(pos, head, member); \
pos = tmp)
#define spa_list_for_each_safe_prev(pos, tmp, head, curr, member) \
for (pos = spa_list_last(curr, __typeof__(*pos), member); \
tmp = spa_list_prev(pos, member), \
!spa_list_is_end(pos, head, member); \
pos = tmp)
#define spa_list_for_each_safe(pos, tmp, head, member) \
spa_list_for_each_safe_next(pos, tmp, head, head, member)
#define spa_list_for_each_safe_reverse(pos, tmp, head, member) \
spa_list_for_each_safe_prev(pos, tmp, head, head, member)
#define spa_list_cursor_start(cursor, head, member) \
spa_list_prepend(head, &(cursor).member)
#define spa_list_for_each_cursor(pos, cursor, head, member) \
for(pos = spa_list_first(&(cursor).member, __typeof__(*(pos)), member); \
spa_list_remove(&(pos)->member), \
spa_list_append(&(cursor).member, &(pos)->member), \
!spa_list_is_end(pos, head, member); \
pos = spa_list_next(&cursor, member))
#define spa_list_cursor_end(cursor, member) \
spa_list_remove(&(cursor).member)
/**
* \}
*/
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* SPA_LIST_H */
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